What is CVE-2021-23140?

CVE-2021-23140 is a critical-severity vulnerability in Gallagher Command Centre, classified under Improper Authorization. CVSS score: 9.9/10. Published 2021-06-11.

How severe is CVE-2021-23140?

Critical severity. CVSS v3 base score is 9.9 out of 10.

Auth bypass in Gallagher Command Centre

CVE-2021-23140

Improper Authorization vulnerability in Gallagher Command Centre Server allows command line macros to be modified by an unauthorised Command Centre Operator. This issue affects: Gallagher Command Centre 8.40 versions prior to 8.40.1888 (MR3); 8.30 versions prior to 8.30.1359 (MR3); 8.20 versions prior to 8.20.1259 (MR5); version 8.10 and prior versions.

Published 2021-06-11 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 9.9 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:L.

EPSS exploit prediction

EPSS: 0.009 (57.6th percentile), scored 2026-10-20.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 58th percentile — 57.6% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.009 · newest: 0.009 · change: 0.000

Affected products

Gallagher Command Centre — versions unspecified, 8.40, 8.30
Gallagher Command Centre

Weakness classification (CWE)

CWE-285 — Improper Authorization

References

security.gallagher.com/Security-Advisories/CVE-2021-23140 (Vendor Advisory)

Frequently asked questions

What is CVE-2021-23140?: CVE-2021-23140 is a critical-severity vulnerability in Gallagher Command Centre, classified under Improper Authorization. CVSS score: 9.9/10. Published 2021-06-11.
How severe is CVE-2021-23140?: Critical severity. CVSS v3 base score is 9.9 out of 10.